noun
mysterious influence; mysterious effect
Refers to an inexplicable, often subtle or profound influence or effect, sometimes with a spiritual or supernatural nuance. Relatively rare and literary.
この薬草には妙用があると伝えられている。
It is said that this herb has a mysterious effect.
彼の言葉には人を動かす妙用が潜んでいた。
His words held a mysterious influence that moved people.